Automate CRI tarball release.

Signed-off-by: Lantao Liu <lantaol@google.com>

script/release/release-cri

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+
+#   Copyright The containerd Authors.
+
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+
+#       http://www.apache.org/licenses/LICENSE-2.0
+
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+#
+# Releases and publishes cri-containerd release tarball.
+#
+set -eu -o pipefail
+
+if [[ -z "${VERSION:-}" ]]; then
+  echo "VERSION is not set"
+  exit 1
+fi
+
+ROOT=${GOPATH}/src/github.com/containerd/containerd
+CRI_COMMIT=$(grep github.com/containerd/cri ${ROOT}/vendor.conf | cut -d " " -f 2)
+
+go get -d github.com/containerd/cri/...
+cd $GOPATH/src/github.com/containerd/cri
+git checkout $CRI_COMMIT
+make clean
+make release TARBALL_PREFIX=cri-containerd LOCAL_RELEASE=true VERSION=${VERSION}
+make release TARBALL_PREFIX=cri-containerd-cni LOCAL_RELEASE=true INCLUDE_CNI=true VERSION=${VERSION}
+
+mkdir -p ${ROOT}/releases/cri
+cp _output/*.tar.gz ${ROOT}/releases/cri
+cp _output/*.tar.gz.sha256 ${ROOT}/releases/cri